Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual teste teve 49.608 estudantes?
 ###Tabelas: CREATE TABLE planica (planica_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Name VARCHAR, Nationality VARCHAR, 1st (m) VARCHAR, 2nd (m) VARCHAR, Points VARCHAR, Overall WC points (Rank) VARCHAR) CREATE TABLE wta_tour_singles_finals_19_7–12 (wta_tour_singles_finals_19_7–12_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score VARCHAR) CREATE TABLE japan_golf_tour_wins_10 (japan_golf_tour_wins_10_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Winning score VARCHAR, Margin of victory VARCHAR, Runner(s)-up VARCHAR) CREATE TABLE current_tests (current_tests_id AUTO_INCREMENT PRIMARY KEY, Test VARCHAR, Subject VARCHAR, Mean score VARCHAR, Standard deviation VARCHAR, Number of Students VARCHAR) CREATE TABLE meistriliiga_clubs_2013 (meistriliiga_clubs_2013_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Position in 2012 VARCHAR, First season in top division INT, Number of seasons in Meistriliiga INT, First season of current spell in top division INT, Top division titles INT)  
SELECT Test FROM current_tests WHERE Number of Students = 49,608